基于GaN器件驱动的Buck变换器的自适应死区控制电路  

Adaptive Dead-time Control Circuit Based on GaN Device Buck Converter

作　　者：孙怡宁 武宏阳 孙雯钰 甄少伟[1,2] 张波[1] SUN Yining;WU Hongyang;SUN Wenyu;ZHEN Shaowei;ZHANG Bo(University of Electronic Science and Technology of China,Chengdu 611731,P.R.China;Chongqing Institute of Microelectronics Industry Technology,UESTC,400000,P.R.China)

机构地区：[1]电子科技大学,成都611731 [2]电子科技大学重庆微电子产业技术研究院,重庆400000

出　　处：《微电子学》2024年第4期611-616,共6页Microelectronics

基　　金：预先研究项目(31513010106)。

摘　　要：提出了一种基于GaN器件驱动的Buck变换器的自适应死区控制电路。该电路通过检测开关节点的负压时长和大小来判定死区时长,通过设定负反馈实现死区时长的自适应调节。开关节点电压上升沿和下降沿最优死区时长分别可以达到0 ns和0.7 ns。该死区控制电路不仅可以实现高精度的亚纳秒死区控制,还可以快速启动并且在负载变化的情况下实时调节死区时长。电路包含负载阶跃保护模块,在检测到负载快速下阶跃时,可以快速重置死区时长,保证功率管可以安全工作。在12 V转1 V的Buck变换器中添加自适应死区控制技术,对比恒定死区控制,在自适应死区时间控制下该变换器转换效率最高可以提升3.7%。This study proposes an adaptive dead-time control circuit for a buck converter driven by GaN devices.The circuit determines the dead-time duration by detecting the duration and magnitude of the negative voltage at switch nodes and achieves adaptive adjustment of the dead-time duration through negative feedback.The optimal dead-time duration for the rising and falling edges of the switch node voltage can reach 0 and 0.7 ns,respectively.This dead-time control circuit achieves high-precision sub-nanosecond dead-time control and can rapidly start and dynamically adjust the dead-time duration when the output load of the buck converter changes.The circuit includes a load step protection module,which can rapidly reset the dead-time duration when the rapid load decrease of the buck converter is detected,ensuring the safe operation of GaN power devices.The adaptive dead-time control technology is added to a 12 V to 1 V buck converter.The conversion efficiency of the buck converter can be improved by up to 3.7%compared with constant dead-time control.

关 键 词：死区控制 GAN BUCK 采样保持 模拟集成电路 

分 类 号：TN86[电子电信—信息与通信工程] TM46[电气工程—电器]